<template>
    <el-card class="category-container">
        <template #header>
            <div class="header">
                <el-button type="primary" :icon="Plus" @click="handleAdd">增加</el-button>
                <el-popconfirm title="确定删除吗？" confirmButtonText='确定' cancelButtonText='取消' @confirm="handleDelete">
                    <template #reference>
                        <el-button type="danger" :icon="Delete">批量删除</el-button>
                    </template>
                </el-popconfirm>
            </div>
        </template>
        <el-table :load="state.loading" ref="multipleTable" :data="state.tableData" tooltip-effect="dark"
            style="width: 100%" @selection-change="handleSelectionChange">
            <el-table-column type="selection" width="55">
            </el-table-column>
            <el-table-column prop="categoryName" label="分类名称">
            </el-table-column>
            <el-table-column prop="categoryRank" label="排序值" width="120">
            </el-table-column>
            <el-table-column prop="createTime" label="添加时间" width="200">
            </el-table-column>
            <el-table-column label="操作" width="220">
                <template #default="scope">
                    <a style="cursor: pointer; margin-right: 10px" @click="handleEdit(scope.row.categoryId)">修改</a>
                    <a style="cursor: pointer; margin-right: 10px" @click="handleNext(scope.row)">下级分类</a>
                    <el-popconfirm title="确定删除吗？" confirmButtonText='确定' cancelButtonText='取消'
                        @confirm="handleDeleteOne(scope.row.categoryId)">
                        <template #reference>
                            <a style="cursor: pointer">删除</a>
                        </template>
                    </el-popconfirm>
                </template>
            </el-table-column>
        </el-table>
        <!--总数超过一页，再展示分页器-->
        <el-pagination background layout="prev, pager, next" :total="state.total" :page-size="state.pageSize"
            :current-page="state.currentPage" @current-change="changePage" />
        <DialogAddCategory ref='addCate' :reload="getCategory" :type="state.type" />
    </el-card>
</template>
  
<script setup>
import { onMounted, onUnmounted, reactive, ref, toRefs, watchEffect } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { ElMessage } from 'element-plus'
import { Plus, Delete } from '@element-plus/icons-vue'
import axios from '@/utils/axios'
import DialogAddCategory from '@/components/DialogAddCategory.vue'

const addCate = ref(null)
const router = useRouter() // 声明路由实例
const route = useRoute() // 获取路由参数
const state = reactive({
    loading: false,
    tableData: [], // 数据列表
    multipleSelection: [], // 选中项
    total: 0, // 总条数
    currentPage: 1, // 当前页
    pageSize: 10, // 分页大小
    type: 'add', // 操作类型
    level: 1,
    parent_id: 0
})
onMounted(() => {
    getCategory()
})
watchEffect(() => {
    console.log(state.pageSize)
})
const unwatch = router.afterEach((to) => {
    // 每次路由变化的时候，都会触发监听时间，重新获取列表数据
    if (['category', 'level2', 'level3'].includes(to.name)) {
        getCategory()
    }
})
onUnmounted(() => {
    unwatch()
})
// 获取分类列表
const getCategory = () => {
    const { level = 1, parent_id = 0 } = route.query
    state.loading = true
    axios.get('/categories', {
        params: {
            pageNumber: state.currentPage,
            pageSize: state.pageSize,
            categoryLevel: level,
            parentId: parent_id
        }
    }).then(res => {
        state.tableData = res.list
        state.total = res.totalCount
        state.currentPage = res.currPage
        state.loading = false
        state.level = level
        state.parentId = parent_id
    })
}
const changePage = (val) => {
    state.currentPage = val
    getCategory()
}
const handleNext = (item) => {
    const levelNumber = item.categoryLevel + 1
    if (levelNumber == 4) {
        ElMessage.error('没有下一级')
        return
    }
    router.push({
        name: `level${levelNumber}`,
        query: {
            level: levelNumber,
            parent_id: item.categoryId
        }
    })
}
// 添加分类
const handleAdd = () => {
    state.type = 'add'
    addCate.value.open()
}
// 修改分类
const handleEdit = (id) => {
    state.type = 'edit'
    addCate.value.open(id)
}
// 选择项
const handleSelectionChange = (val) => {
    state.multipleSelection = val
}
// 批量删除
const handleDelete = () => {
    if (!state.multipleSelection.length) {
        ElMessage.error('请选择项')
        return
    }
    axios.delete('/categories', {
        data: {
            ids: state.multipleSelection.map(i => i.categoryId)
        }
    }).then(() => {
        ElMessage.success('删除成功')
        getCategory()
    })
}
// 单个删除
const handleDeleteOne = (id) => {
    axios.delete('/categories', {
        data: {
            ids: [id]
        }
    }).then(() => {
        ElMessage.success('删除成功')
        getCategory()
    })
}
</script>
  
<style></style>